GoPro AHDAF-001 Anti-Fog Inserts for All GoPro Housings, 4 to 5 Uses Per Set. Prevent your camera's housing from fogging, even in cold temperatures/humid environments. Great value and performance: includes 3 sets of anti-fog inserts. Each set lasts 4-5 uses and can be dried in an oven (3 minutes) and used again. Vendor Part # AHDAF-001